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Advent calendar 2015
8 December
All 2015 advent puzzles
~
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What is the largest number of factors which a number less than a million has?
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720720 has 240 factors.
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Most recent collections
Advent calendar 2025
Advent calendar 2024
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List of all puzzles
Tags
prime factors
time
probability
triangles
albgebra
quadratics
ellipses
sport
dominos
area
determinants
arrows
squares
even numbers
multiplication
cryptic clues
complex numbers
gerrymandering
balancing
cube numbers
algebra
the only crossnumber
square roots
dates
neighbours
wordplay
books
sums
polynomials
prime numbers
integration
pascal's triangle
coins
numbers
crosswords
triangle numbers
factors
circles
palindromes
means
binary
quadrilaterals
doubling
square numbers
cryptic crossnumbers
mean
2d shapes
routes
shapes
sum to infinity
cubics
graphs
spheres
speed
sets
matrices
range
planes
tournaments
symmetry
polygons
surds
probabilty
pentagons
folding tube maps
chalkdust crossnumber
calculus
square grids
xor
partitions
perimeter
irreducible numbers
crossnumbers
lists
volume
taxicab geometry
averages
rugby
perfect numbers
shape
coordinates
addition
differentiation
christmas
geometric mean
remainders
integers
people maths
3d shapes
cards
powers
geometry
lines
odd numbers
dodecagons
tangents
geometric means
products
multiplaction squares
trigonometry
unit fractions
sequences
ave
clocks
menace
indices
axes
digital clocks
hexagons
digits
rectangles
chocolate
elections
fractions
angles
tiling
logic
money
percentages
division
colouring
multiples
dice
advent
digital products
combinatorics
bases
regular shapes
medians
number
consecutive numbers
functions
proportion
scales
games
chess
floors
factorials
expansions
star numbers
consecutive integers
grids
parabolas
decahedra
median
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